public async Task <IEnumerable <FileFragmentedEvent> > Handle(FragmentTextFileCommand request, CancellationToken cancellationToken)
{
if (request.SizeInBytes <= _settings.ChunkSizeInBytes)
{
return(new[]
{
new FileFragmentedEvent
{
Extension = request.Extension,
UploadId = request.UploadId,
FileName = request.FileName,
Offset = 0,
Length = request.SizeInBytes
}
});
}
var initialOffsets = FindInitialOffsets(request.SizeInBytes, _settings.ChunkSizeInBytes);
var rightBorders = await Task.WhenAll(initialOffsets.Select(offset =>
FindRightBorderAsync(offset, request.SizeInBytes, request.UploadId, cancellationToken)));
return(ConstructEvents(rightBorders, request));
}
private IEnumerable <FileFragmentedEvent> ConstructEvents(long[] rightBorders, FragmentTextFileCommand request)
{
var left = 0L;
foreach (var right in rightBorders.Where(b => b != FailureFlag).OrderBy(x => x))
{
yield return(new FileFragmentedEvent
{
Extension = request.Extension,
UploadId = request.UploadId,
FileName = request.FileName,
Offset = left,
Length = right - left
});
left = right + 1;
}
// The last part
yield return(new FileFragmentedEvent
{
Extension = request.Extension,
UploadId = request.UploadId,
FileName = request.FileName,
Offset = left,
Length = request.SizeInBytes - left
});
}